related: i have been told that during the american civil war it was not uncommon for the recruits going into battle to load their weapons for the volley fire by ranks in sync with their comrades, but forgetting to put a fresh cap on their rifle. their sergeant, after practice live fire drills would go down the line and have them drop the ramrod down the muzzle of their rifle, and heaven forbid one didn't go down all the way. one unlucky soul was found to have six loads in his barrel, all of which he had to extract with a worm while suffering further under the ministrations of the sarge. if it had happened in a real battle the potential for an explosion setting it all off if he finally did recap his rifle (another idiom we've added to the language?) and potentially killing him and maybe someone next to him.
* - leaway hasn't got the same oomph.
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I have seen this happen for real. I loaned a reproduction musket to a friend for use at a reenactment at Waterloo. I later pulled 6 loads out of it! I have also seen double loads ignite and the recoil knock the shooter over. Blanks only bigod but cause for thought all the same.